Boogerman codes:

Flatulent Swamps(beginning of game):
Scab Creature
Abdominable Sewer Man
Pus Creature
Miner Goblin


Hickboy(Flatulent Swamps boss):
Pus Creature
Scab Creature
Frrt Ghost
Boogerman


The Pits:
Frrt Ghost
Nose Goblin
Ghost
Pus Creature


Revolta (Pits Boss):
Troll
Miner Goblin
Nose Goblin
Frrt Ghost


Boogerville:
Scab Creature
Frrt Ghost
Abdominal Sewer Man
Boogerman


Flyboy (Boogerville Boss):
Boogerman
Pus Creature
Miner Goblin
Scab Creature


Mucous Mountains:
Nose Goblin
Scab Creature
Frrt Ghost
Troll

Nasal Caverns:
Nose Goblin
Pus Creature
Ogre
Scab Creature


Deodor Ant (Mucous Mountains/Nasal Caverns Boss):
Frrt Ghost
Scab Creature
Troll
Miner Goblin


Pus Palace:
Pus Creature
Boogerman
Frrt Ghost
Pus Creature

Booger Meister (the big bad booger boss):
Pus Creature
Abdominable Sewer Man
Boogerman
Miner Goblin